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Posted by **Brittni** on Sunday, December 5, 2010 at 7:21pm.

- Math -
**MathMate**, Sunday, December 5, 2010 at 7:56pmFirst row = 20 seats,

second row = 21 seats,

...

nth row = 19+n seats,

...

50th row = 19+50 = 69 seats

Write the number of seats in forward and reverse order:

19 + 69 = 88

20 + 68 = 88

...

44 + 44 = 88

...

69 + 19 = 88

---------

Sum = 50*(88/2) = 2200 seats

- Math -
**Amber**, Thursday, May 10, 2012 at 8:19pm19+n

u#1=19+1

u#1=20

u#50=19+50

u#1=69

50(20+69)/2

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